<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="../static/css/hello.css">
</head>
<body>
定义一个用户的form表单：
<form action="/doBindForm" method="post">
    用户名：<label><input type="text" name="username"></label><br>
    密码：<label><input type="password" name="pwd"></label><br>
    <input type="submit" value="提交">
</form>
</body>
</html>